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Anthropic's Claude Mythos model reportedly accessed by unauthorized users

Anthropic is investigating unauthorized access to its Claude Mythos model, reportedly available to a small group since the company announced controlled testing.

Anthropic's Claude Mythos model reportedly accessed by unauthorized users
via The Verge AI

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Anthropic is investigating a security incident involving unauthorized access to Claude Mythos, a model the company had positioned as too dangerous for public release. According to Bloomberg, a small group of unauthorized users gained access to the model starting the day Anthropic announced plans to offer it to select companies for testing. The breach contradicts Anthropic's public messaging about AI safety and cybersecurity capabilities.

Lead coverage: The Verge AI — Anthropic’s Mythos breach was humiliating ↗

🕰 The timeline · 1 source

The Verge AI reporting rumored · 8h ago · 3/5

Anthropic’s Mythos breach was humiliating ↗

Anthropic is investigating a security incident involving unauthorized access to Claude Mythos, a model the company had positioned as too dangerous for public release. According to Bloomberg, a small group of unauthorized users gained access to the model starting the day Anthropic announced plans to offer it to select companies for testing. The breach contradicts Anthropic's public messaging about AI safety and cybersecurity capabilities.

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Cluster ID
df0a2796e0
Importance (max)
3
Members
1
Sources
The Verge AI
Earliest
2026-04-23T18:24:56.000Z
Latest
2026-04-23T18:24:56.000Z
Lead URL
https://www.theverge.com/ai-artificial-intelligence/917644/anthropic-claude-mythos-breach-humiliation